Ultrasound Examination Scoter

Abstract

To avoid the shape of an inspection target object or the arrangement state of a skater from restricting the inspection range.SOLUTION: An ultrasonic skater includes: a skater body having a liquid sending hole for sending liquid to the outside; a liquid introduction unit for guiding liquid into the skater body; and an ejection tube located outside the skater body. The ejection tube has a flow passage connected to the liquid sending hole and an ejection hole connected to the flow passage and ejecting liquid to the outside of the ejection tube. The ejection tube has at least one deflection part which changes the direction of flow of liquid in the flow passage.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an ultrasonic inspection scatterer used in ultrasonic inspection. [Background technology]

[0002] In ultrasonic inspection, a method is known in which water is sprayed onto an object to be inspected using a scatterer, and ultrasonic waves are propagated in the water column generated by the spray, thereby inspecting the object by ultrasonic transmission. For example, Patent Document 1 proposes an ultrasonic measuring device that includes a pressure reducing device that reduces the pressure inside the housing in order to guide water from an opening into the housing, and that guides water that is sprayed from an injection port and hits the surface of the object being inspected toward the opening side of the housing to form a water column. Furthermore, in Patent Document 2, a cover is provided on the nozzle that sprays water to prevent water that hits the object to be inspected and splashes from hitting the water column generated by the jet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-77196 [Patent Document 2] Japanese Patent Application Publication No. 2020-34390 Summary of the Invention [Problem to be solved by the invention]

[0004] When propagating ultrasonic waves, it is desirable to aim a water column at the part to be inspected almost perpendicularly near the part and propagate the ultrasonic waves through this water column. Even if the water column is aimed at the part to be inspected at an angle, the ultrasonic waves will strike the part at an angle, preventing them from propagating into the object, affecting the inspection accuracy. Furthermore, depending on the shape and position of the object, it may not be possible to aim the water column at the part to be inspected, making ultrasonic inspection impossible.

[0005] The present invention was made against the background of the above circumstances, and aims to provide an ultrasonic inspection scatterer that enables ultrasonic inspection to be performed widely and effectively regardless of the shape of the object to be inspected or the arrangement of the scatterer. [Means for solving the problem]

[0006] The ultrasonic inspection scatterer according to one embodiment of the present invention comprises a scatterer body having a liquid delivery hole for delivering a liquid to the outside; a liquid introduction portion for introducing a liquid into the inside of the scatter body; an injection pipe located outside the scatter body; The injection pipe has a flow path connected to the liquid feed hole, and has a jet hole connected to the flow path for jetting the liquid to the outside of the injection pipe, and the injection pipe has one or more deflection parts for changing the flow direction of the liquid in the flow path. death, The flow path of the deflection section has one or more flat surfaces facing the upstream liquid flow direction. . [Effects of the Invention]

[0007] According to the present invention, restrictions on the placement location of ultrasonic inspection scatters are reduced, making it possible to perform ultrasonic flaw detection at a variety of locations, and even making it possible to perform measurements in cases where placement itself is difficult. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side cross-sectional view of an ultrasonic inspection scatterer according to one embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a diagram illustrating the flow of water in the ultrasonic testing scatterer. [Figure 5] FIG. 10 is a diagram illustrating the use of the ultrasonic inspection scatter. [Figure 6A] 1A and 1B are diagrams illustrating the use of a scatterer for ultrasonic testing according to a related art; [Figure 6B]10A and 10B are diagrams illustrating the use of a scatterer for ultrasonic testing according to another related art. [Figure 7A] FIG. 10 is a side cross-sectional view of the injection tube of another embodiment of an ultrasonic inspection scatterer. [Figure 7B] FIG. 7B is a view taken along the arrow A in FIG. 7A. [Figure 8A] FIG. 10 is a side cross-sectional view of a scatterer for ultrasonic inspection according to yet another embodiment. [Figure 8B] FIG. 10 is a side cross-sectional view of a scatterer for ultrasonic inspection according to yet another embodiment. [Figure 9A] 1A and 1B are a plan view and a front view showing a test piece used in the examples. [Figure 9B] FIG. 1 is a C-scan image of the ultrasonic test results of the test piece. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment 1) An embodiment of the present invention will be described below. As shown in Figure 1, an ultrasonic testing scatterer 1 according to one embodiment has a scatterer body 2. The scatterer body 2 has a liquid delivery hole 20 in one wall portion for injecting water to the outside, and a water inlet pipe 21 connected to the other side wall. The water inlet pipe 21 corresponds to the liquid introduction section of the present invention. The water inlet pipe 21 is connected to an external water supply source to supply water. The scatter body 2 has a water supply channel 22 that connects the water inlet pipe 21 to the liquid feed hole 20. Although the water supply channel 22 is shown simply in the figure, its configuration is not particularly limited, and it may have any suitable path as long as it can connect the water inlet pipe 21 and the liquid feed hole 20.

[0010] A probe 23 is fitted and fixed to one side of the scatter body 2 facing the liquid supply hole 20, and the inner surface of the probe 23 is exposed to the water supply channel 22. An ultrasonic transmission cable 24 is connected to the probe 23, and the other end of the ultrasonic transmission cable 24 is connected to a flaw detector (not shown). When the ultrasonic inspection scatterer 1 is used for transmission, the ultrasonic signal sent to the flaw detector is transmitted to the probe 23 via the ultrasonic transmission cable 24. When the ultrasonic inspection scatterer 1 is used for reception, the ultrasonic signal acquired by the probe 23 is sent to the flaw detector via the ultrasonic transmission cable 24, and analysis related to flaw detection is performed by the flaw detector.

[0011] A spray pipe 3 is connected to the outside of the scatter body 2 on the liquid supply hole 20 side, and a flow path 30 of the spray pipe 3 communicates with the liquid supply hole 20. The spray pipe 3 may be formed integrally with the scatter body 2, or may be joined to the scatter body 2. Furthermore, when joined, it may be detachable, and at that time it may be possible to replace it with a spray pipe of a different structure. The injection pipe 3 is made up of injection pipes 3A, 3B, and 3C arranged in the flow direction, and the flow paths 30A, 30B, and 30C of the injection pipes 3A, 3B, and 3C are sequentially connected to each other to form a flow path 30.

[0012] The flow path 30A of the ejection pipe 3A is positioned so as to follow the liquid sending direction of the liquid sending hole 20. The ejection direction of the liquid feed hole 20 is perpendicular to the side wall 2A of the scatter body 2 on the liquid feed hole 20 side, and the flow path 30A also extends perpendicular to the side wall 2A. The flow path 30A is configured as a tapered hole whose inner diameter becomes smaller toward the downstream side, and the injection pipe 3A forms a throttle portion.

[0013] A first flow rectifying section 31 is disposed in a flow area in the flow path 30A near the liquid feed hole 20. The first flow rectifying section 31 has an outer shape that fits substantially within the inner circumferential surface of the flow path 30A. 2, the first flow rectifying section 31 has a through hole 31A in the center and a plurality of flow rectifying plates 31B radially arranged at equal angular intervals around the periphery of the through hole 31A, with the front and back surfaces of the flow rectifying plates 31B forming flow rectifying surfaces 31C. As a result, water passing through the flow path 30A passes through the through hole 31A of the first flow rectifying section 31 and the spaces between the flow rectifying surfaces 31C, and its flow is rectified by the flow rectifying surfaces 31C. The side surfaces of the flow rectifying plates 31B have a tapered shape that follows the inner surfaces of the tapered holes of the flow path 30A. However, in this embodiment, the shape and manufacturing method of the first rectifying portion are not particularly limited. The central through-hole may not be provided. The first rectifying portion 31 may be formed integrally with the injection pipe 3A.

[0014] The ejection pipe 3B is connected to the downstream end of the ejection pipe 3A, and the flow path 30B of the ejection pipe 3B has the same inner diameter as the inner diameter of the downstream end of the flow path 30A, and has approximately the same inner diameter all the way to the downstream side. Furthermore, the injection pipe 3B has an overall rounded shape, and is curved in one direction at an angle of less than 90 degrees, and the flow path 30B inside is also curved in the same way, changing the flow direction of the flow path.

[0015] At the tip of the ejection pipe 3B, there is another ejection pipe 3C having a flow path 30C, and the flow paths 30B and 30C are connected. An upstream flow path 30C1 of the flow path 30C is deflected by a few degrees with respect to the flow direction at the downstream end of the flow path 30B, and a downstream flow path 30C2 of the flow path 30C changes the flow direction at an angle of approximately 90 degrees with respect to the flow path direction of the flow path 30A. In other words, the shape of the ejection pipe 3B and a part of the shape of the ejection pipe 3C constitute the deflection portion of this embodiment.

[0016] The injection pipe 3C has a side wall surface 33A positioned outside the scatter body 2 that is straight along the side wall 2A of the scatter body 2 from the upstream end to the downstream end. On the other hand, in the flow path 30C1 on the upstream side of the ejection pipe 3C, the side outer wall 33B located inside the scatter body 2 has a tapered shape that gradually moves outward toward the downstream side, and in the flow path 30C1, the side surface facing the scatter body 2 also has a tapered shape. Therefore, the upstream side of the ejection pipe 3C having the flow path 30C1 is a throttle portion. The downstream side of the injection pipe 3C having the flow path 30C2 has a straight pipe shape including the outer side wall 33A and the inner side wall 33C.

[0017] A second flow rectifier 32 is disposed within the flow path 30C1. The second flow rectifier 32 has an outer shape that fits substantially within the upstream inner circumferential surface of the flow path 30C1. As shown in FIG. 3, the second flow rectifier 32 has a through-hole 32A in the center, and a plurality of flow rectifier plates 32B are radially arranged at equal angular intervals around the periphery of the second flow rectifier 32, with the front and back surfaces of the flow rectifier plates 32B serving as flow rectifying surfaces 32C. As a result, water passing through the flow path 30C1 passes through the through-holes 32A of the second flow rectifier 32 and the spaces between the flow rectifying surfaces 32C, 32C, and its flow is rectified. However, in this embodiment, the shape and manufacturing method of the second rectifying portion are not particularly limited. The central through-hole may not be provided. The second rectifying portion 32 may be formed integrally with the injection pipe 3C.

[0018] In this embodiment, the flow path between the deflection section and the nozzle hole and the flow path upstream of the deflection section both have rectifiers, but one of these may have a rectifier, or the flow path may have two or more rectifiers. It is considered effective to position the rectifier downstream of the deflection section. Furthermore, the flow path may not have a rectifier, and the rectifier may be located within the main body of the scatterer.

[0019] The tip of the injection pipe 3C is open and is provided with an ejection hole 4, and a flow path 30C2 is connected to the ejection hole 4. The size of the ejection hole 4 is, for example, 6 to 9 mm in diameter. However, in this embodiment, the size of the ejection hole is not particularly limited, and the shape is not limited to a round hole or the like.

[0020] When using the ultrasonic inspection scatter 1, water is supplied from the outside to the water introduction pipe 21 and introduced into the scatter body 2. Note that in this embodiment, a liquid other than water may be used. The water introduced into the scatter body 2 moves along the water supply passage 22. The amount of water supplied to the water introduction pipe 21 varies depending on the diameter of the nozzle hole and the length of the water column generated, but can be, for example, 5 to 10 L / min. However, in this embodiment, the water amount is not limited to this value. The water moving in the water supply channel 22 moves successively and reaches the liquid feed hole 20. The water that reaches the liquid feed hole 20 is discharged from the liquid feed hole 20 along the flow direction of the water supply channel 22 into the injection pipe 3 located outside the scatter body 2.

[0021] The flow state of water in the jet pipe 3 will be explained with reference to FIG. The water discharged from the liquid delivery hole 20 first moves through the flow path 30A of the ejection pipe 3A. As it passes through the first flow straightening section 31, the water flow is straightened and flows downstream, and the flow is narrowed along the tapered surface of the flow path 30A, so that it reaches the flow path 30B of the ejection pipe 3B in a laminar flow state. In the ejection pipe 3B, the water hits a curved inner surface 30B1 of the flow path 30B located on the outside, is reflected, and changes its flow direction, flowing at an angle of less than 90 degrees to the flow path 30A.

[0022] The water flowing through flow path 30B reaches injection pipe 3C and passes through second flow straightening section 32 within flow path 30C1. As the water passes through second flow straightening section 32, its flow is straightened and it flows downstream. The flow is then narrowed along the tapered surface of flow path 30C1, and it reaches flow path 30C2 in a laminar state. At this time, the flow direction changes slightly. As a result, the water flowing through flow path 30C2 flows at an angle of approximately 90 degrees relative to the flow direction of the water flowing through flow path 30A, and the water is ejected from ejection hole 4, generating a water column 40. The water column 40 formed by the jet of water maintains a laminar flow state of the water, allowing for good propagation of ultrasonic waves. In this embodiment, the ejection pipe 3 is described as being composed of ejection pipes 3A, 3B, and 3C, but the number is not limited thereto, and the ejection pipes may be integrally formed. When there are multiple ejection pipes, some of them may be replaceable with ejection pipes having different configurations.

[0023] When the ultrasonic inspection scatterer 1 is used for transmission, an ultrasonic signal is sent to the probe 23 through the ultrasonic transmission cable 24, and ultrasonic waves are emitted from the inner surface of the water supply passage of the probe 23. The ultrasonic waves propagate in a straight line within the water in the water supply channel 22, and then propagate along the direction of the water flow within the channel 30 in the injection pipe 3. At the deflection section, the ultrasonic waves are reflected by the channel inner surface 30B1 and propagate within the water flow. The ultrasonic waves propagate through the water column 40 ejected from the nozzle 4, hit the object under test, pass through the object, and are received by the receiving ultrasonic inspection scatterer. The receiving ultrasonic inspection scatterer may have a structure similar to that of the ultrasonic inspection scatterer 1, or may have another structure. On the other hand, when the ultrasonic inspection scatterer 1 is used for receiving, the ultrasonic waves that pass through the object to be inspected are propagated through the water column 40 ejected by the ultrasonic inspection scatterer 1 and the water flow in the flow path 30 in the jet pipe 3, and then through the water flow in the water supply path 2 in the scatterer body 2. The ultrasonic waves are received by the probe 23 and transmitted as ultrasonic signals via the ultrasonic transmission cable 24 to a flaw detector (not shown), where they can be analyzed for flaw detection.

[0024] FIG. 5 shows an example in which the ultrasonic inspection scatterer 1 is used. The ultrasonic inspection scatterer 1, held by the scatterer fixture 5, is placed near the object under test 6, with the injection nozzle 4 positioned in front of the object under test 6A. The opposing ultrasonic inspection scatterer 50 is placed on the opposite side of the object under test 6A. In this example, the object under test 6A is a piece extending left and right in the figure. The ultrasonic inspection scatterers 1, 50 can be moved left and right to measure a wide area of ​​the object under test 6A. The outer sidewall 33A of the injection pipe 3C is aligned in a straight line, minimizing interference between the scatterer body 2 and injection pipes 3A, 3B, and 3C and the object under test 6 when the ultrasonic inspection scatterer 1 is moved left and right in the figure. This allows for inspection while minimizing the undetectable area of ​​the object under test 6A. If the side wall 33A is not positioned in a straight line, a part of the side wall will interfere with the object to be inspected, making it difficult to move the ultrasonic inspection scatterer 1 any further, and narrowing the inspectable range.

[0025] (Reference example 1) FIG. 6A shows an example of performing ultrasonic testing using an ultrasonic testing scatterer 60 and an ultrasonic testing scatterer 50 according to related art, which have a different structure from the ultrasonic testing scatterer 1 of this embodiment. In the ultrasonic inspection scatterer 60, a spray pipe 62 is provided on one side wall of the scatterer body 61, and the spray pipe 62 is oriented perpendicular to the wall surface of the scatterer body 61, so that water is sprayed in that direction. Therefore, when the ultrasonic inspection scatterer 60 is positioned in line with the inspection target 6A, the scatterer body 61 and the inspection target 6 interfere with each other, making it impossible to move the ultrasonic inspection scatterer 60 any further to the left in the figure, and the measurable range of the inspection target becomes narrower.

[0026] (Reference example 2) 6B shows yet another example of use, in which the size of the object to be inspected 7 is relatively small compared to the ultrasonic inspection scatterers 60, 50. In this case, the spray pipe 62 cannot be positioned inside the part to be inspected 7A, making it impossible to measure the entire part to be inspected 7A. Even in such a situation, in this embodiment, if the spray pipe 3C can be positioned inside the part to be inspected 7, it is possible to measure the part to be inspected 7A.

[0027] (Embodiment 2) Next, another embodiment of a scatterer for ultrasonic testing will be described with reference to Figures 7A and 7B. In this embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted or simplified. In the second embodiment, the ejection pipe 3D is located between the ejection pipe 3A and the ejection pipe 3C. The injection pipe 3D deflects the flow path direction by less than 90 degrees, as in the first embodiment, but the outer inner surface of the flow path 30D where the flow path 30A hits is not curved, but is composed of a flat surface 30D1 inclined at an angle of less than 90 degrees with respect to the flow direction of the flow path 30A. The inclined flat surface 30D1 can reduce turbulence in the water flow when the water hits and is reflected, changing the flow direction, and can also improve the reflection of ultrasonic waves. In this embodiment, the surface on which the water flow hits is described as being composed of a single plane with the same inclination angle, but it is also possible to adjust the direction of water reflection by arranging multiple flat surfaces with different inclination angles, and it may also be a combination of a flat surface and a curved surface.

[0028] (Embodiment 3) Still another embodiment will be described with reference to FIG. 8A. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified. In this embodiment 3, the injection pipe 3E is located between the injection pipe 3A and the injection pipe 3C. The injection pipe 3E has a shape that deflects the water flow direction at an angle of less than 45 degrees relative to the flow path 30A of the injection pipe 3A, and the outer flow path surface of the flow path 30E that contacts the flow path 30A has a curved shape. The water flow that passes through the flow path 30E of the injection pipe 3E flows into the flow path 30C of the injection pipe 3C, moving the water at an angle of 45 degrees relative to the flow path 30A, and the water is injected from the nozzle 4 at an angle of 45 degrees relative to the flow direction of the flow path 30A. In this embodiment, the deflection portion of this embodiment is formed by the shape of the injection pipe 3E and a part of the shape of the injection pipe 3C. In this embodiment, the side wall 33A of the injection pipe 3C is positioned in a straight line, but is at an angle of 45 degrees to the side wall 2A of the scatter body 2.

[0029] (Embodiment 4) Still another embodiment will be described with reference to FIG. 8B. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified. In this fourth embodiment, a spray pipe 3F is located between the spray pipe 3A and the spray pipe 3C. The spray pipe 3F has a shape that deflects the water flow direction by less than 60 degrees relative to the flow path 30A of the spray pipe 3A, and the outer flow path surface of the flow path 30F that contacts the flow path 30A has a curved shape. The water flow that passes through the flow path 30F of the spray pipe 3F flows into the flow path 30C of the spray pipe 3C, and in the flow path 30C2, the water moves at an angle of 60 degrees relative to the flow path 30A, and is sprayed from the ejection hole 4. In this embodiment, the side wall 33A of the injection pipe 3C is positioned in a straight line, but is at an angle of 60 degrees to the side wall 2A of the cavity carter body 2.

[0030] As described above, the deflection angle in the ejection pipe can be set to an appropriate angle, and an appropriate angle can be used depending on the shape of the object to be inspected, etc. A plurality of deflection units may be provided. In addition, in the third and fourth embodiments, the outer surfaces of the flow channels 30E and 30F are formed as curved surfaces, but similar to the second embodiment, they may be provided with inclined flat surfaces. [Example]

[0031] An embodiment of the present invention will be described below. As shown in FIG. 9A, an artificial defect was formed in a test piece 100 whose thickness was changed stepwise, and a flaw detection test was performed using the ultrasonic inspection scatterer shown in the first embodiment, and an inspection image was obtained. The plate thickness t1 was 1.2 mm, the plate thickness t2 was 2.3 mm, the plate thickness t3 was 3.5 mm, the plate thickness t4 was 4.5 mm, and the plate thickness t5 was 5.7 mm, and the planar shape of the test piece 100 was 650 mm long and 200 mm wide. The rectangular artificial defect 100A had a size of 12 mm x 12 mm, the horizontal artificial defect 100B had a size of 2.5 mm x 21.5 mm, and the vertical artificial defect 100C had sizes of 21.5 mm x 2.5 mm. The C-scan image of the inspection image changes color as the ultrasonic waves attenuate. Attenuating material cut to a specified size was inserted inside the test piece as an artificial defect, and all defects were detected. The difference in transmittance between the defective and healthy parts was 15 dB or more, demonstrating sufficient detection capability.

[0032] The present invention has been described above based on the above embodiments and examples, but the embodiments can be modified as appropriate without departing from the scope of the present invention. [Explanation of symbols]

[0033] 1 Ultrasound Examination Scarter 2. Scarter body 2A side wall 3B Injection pipe 3C injection tube 3D injection tube 3E injection tube 3F injection pipe 4 Spout hole 6. Inspection object 6A Inspected part 20 Liquid feed hole 21 Water introduction pipe 22 Water supply channel 23 Probe 24 Ultrasonic transmission cable 30 flow path 30A flow path 30B Flow path 30B1 flow path inner surface 30C Flow path 30D1 flat section 31 1st rectifier 32 2nd rectifier 33A Side outer wall 33B Side outer wall 33C Side wall 40 water column

Claims

1. a scatter body having a liquid delivery hole for delivering liquid to the outside; a liquid introduction portion for introducing a liquid into the inside of the scatter body; an injection pipe located outside the scatter body; the ejection pipe has a flow path connected to the liquid feed hole, and has an ejection hole connected to the flow path and ejecting the liquid to the outside of the ejection pipe, and the ejection pipe has one or more deflection parts that change the flow direction of the liquid in the flow path, An ultrasonic inspection scatterer in which the flow path of the deflection section has one or more flat surfaces facing the upstream liquid flow direction.

2. 2. The ultrasonic inspection scatterer according to claim 1, wherein the flow path has one or more rectifying sections.

3. 3. The ultrasonic inspection scatterer according to claim 2, wherein the rectifying section is provided in one or both of the flow path between the deflection section and the nozzle hole and the flow path upstream of the deflection section.

4. 4. The ultrasonic inspection scatterer according to claim 1, wherein the flow path has a narrowed portion in which the cross-sectional area of ​​the flow path on the downstream side is smaller than the cross-sectional area on the upstream side.

5. 5. The ultrasonic inspection scatterer according to claim 1, wherein the ejection holes are connected to a flow path in a portion of the ejection pipe that has a straight pipe shape.

6. 6. The ultrasonic inspection scatterer according to claim 1, wherein the flow path located in the deflection section has a curved surface facing the flow direction of the liquid on the upstream side.

7. An ultrasonic inspection scatterer according to any one of claims 1 to 6, wherein, between the ejection hole and the deflection section close to the ejection hole, the far side outer wall of the ejection pipe on the closer side and the farther side from the scatter body extends straight.

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